<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>登录</title>
</head>
<body>
    <h2 style="margin-bottom: 20px;">登录</h2>
    <form action="/yanzheng" method="post">
        用户名：<input type="text" name="username"><br>
        密码：<input type="password" name="password"><br>
        <button>提交</button>
    </form>
</body>
</html>